Ultra Heat GMV Multi VRF_Heat Recovery Serial
21
(1) Conform to the following principles during piping connection: Connection pipeline should be as
short as possible. The height difference between indoor and outdoor units should be as short as possible.
Keep number of bends as little as possible. The radius of curvature should be as large as possible.
(2) Weld the connection pipes between indoor and outdoor unit. Please strictly conform to the
requirements for welding process. Rosin joints and pin holes are not allowable.
(3) When laying the pipes, be careful not to deform them. The radius of bending parts should be
more than 200mm (7-7/8inch). The pipes cannot be repeatedly bent or stretched; otherwise the material
will get harden. Do not bend or stretch the pipe over three times at the same position.
(4) Please use a torque wrench to connect union nut on the indoor unit. See Fig.24.
Fig.24
1) Align the expansion end of copper pipe with the center of threaded joint. Tighten the flare nuts
with your hands.
2) Tighten the flare nuts with torque wrench until you hear "click" sound.
3) Use sponge to wrap the connecting pipe and joints without thermal insulation and tie it up with
plastic tape.
4) A mounting support for the connection pipe is required.
5) The curvature degree of connection pipe should not be small, otherwise the pipe might crack.
Installation personnel should use tube bender when bending the pipe.
6) Don't forcibly stretch the pipe joint, otherwise indoor capillary or other pipes might be damaged
and lead to refrigerant leakage.
4.4.2 Y-type manifold
(1) Y-type manifold
Fig.25
(2) Y-type manifold has serveral pipe sections with different pipe size, which facilitates to match with
various copper pipe. Use pipe cutter to cut in the middle of the pipe section with different pipe size and
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